Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03be891ebed59d…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 04:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7c39ab5870c05fcc9adec07f99a9a987 SHA-1: 5312aac4cbe9df66fdac508580d200450168cc5f SHA-256: 4d03be891ebed59d72e619fcd95acaf1fcfaf385d61a23d784c49447c6e3cf64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/12kqi0cra7ovn6jine3vd3lcu7/nejerimasemozefutuwuronav.pdf In PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/74066245141.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210507030232.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/zisamepewilelomo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0ef9f231c58b5a243bcb14adfedecfbc/50622642592.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160917e41b3384---jenamowukebudopedo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/51769e176580f0b473f07e9e0428a956/kutimokesoxivoj.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/lunimexitifekilodifo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/51469610181.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097727e5d0c9---turupodibopotosuvinaz.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/40c8c7281a9d8c3ea878b30da952fa3c/jipapenekijo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/g1v71b4dig9p10m1a1rsi7l685/supomenafujigapi.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/44196583225.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9daca4bb---gogowukupunu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32fe5c6bc---49017470923.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f6hmqhlq0pb2lobc542081c618/putamuxafiteri.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ce633aef0fb68e5b516ef120a4806b2b/34154448286.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/75111786436.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607279c7a3c0c---gapewamerubu.pdfIn PDF document text
    • https://paperland.bg/uploads/file/54621624670.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f20ce2a0bbadad22141ca9847867e56f/54439179864.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f507b3c7c8---61847564501.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd603ad1e9---lazozofenawuwovat.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622003419.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/30255744130.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c5b4f2e9---balivibasufevova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ps3+online+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 10344 bytes
SHA-256: d9ad3feaede816d6fe1a5f5d192b564ddca46fbcacbad6174fe0fd82b97559b1
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16292 bytes
SHA-256: ea22a481ffafc5c3c2cf3571c419e64d05d9d55e4e7bfa72d32c699e79042e7a
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1